Fold your paper so that it will fit the envelope.

Avoid blots and erasures; they indicate carelessness or unbecoming
haste.

Address your letter distinctly.

Here is a good form:

Mr. George W. White,
Boston,
1101 Sioux St. Mass.

LETTERS OF INTRODUCTION

At some time or another one has to write a letter of introduction,
and sometimes he has had to pay for it.

If you should give such a letter to a man to introduce him to
another with whom you trade, the law has held that the introducer
is responsible for any reasonable bills the introduced may
contract with the receiver of the letter.

Never give a letter of introduction to a man you are not sure of.

In addressing a letter of introduction which is to be handed in
person, do it in this way:

Mr. George W. Brown,
Washington, D. C.